As mentioned in the description, if you are a new player looking for a 100% guide, please refer to this one instead. It's the most up-to-date version with a lot more events, details, and leeway factored in. This guide is intended for players who were using this original version before it was replaced, as the schedule has since changed quite a bit. https://steamproxy.net/sharedfiles/filedetails/?id=3152126765

It's extremely important to carry a matching persona when working on social links, as this provides a 1.51x multiplier to all social points earned during interactions. While this is generally unnecessary until after reaching rank 2 of any Social Link, it's best to get into this habit early.

On top of this, maxing your Charm Social Stat and being the highest scorer in your exams also provides an additional 1.51x multiplier each, so it's important to improve your Social Stats at an appropriately fast rate to take advantage of not needing to spend additional time with your Social Links.

4/18 Fool – S.E.E.S.
Automatic advancement.

4/22 Magician – Classmate
Availability: Daytime Tue, Thu, Fri @ Classroom 2-F

4/23 Chariot – Track Team
Availability: Daytime Mon, Tue, Thu, Fri @ Classroom 2-F / Gym Hallway

4/24 Strength – Team Manager
Availability: Daytime Wed, Sat @ 2F Classroom Hallway

4/25 Hierophant – Old Couple
Availability: Daytime Tue, Wed, Thu, Fri, Sat, Sun @ Bookworms (Iwatodai Strip Mall)

4/27 Emperor – Student Council
Availability: Daytime Mon, Wed, Fri @ Student Council Room (2F Classroom Hallway)

4/29 Hermit – Online Game
Availability: Daytime Sunday & Holidays @ Desk in Protagonist's Room (Play the MMORPG)

5/7 Justice – Treasurer
Availability: Daytime Tue, Thu, Sat @ 2F Classroom Hallway

5/8 Temperance – Exchange Student
Availability: Daytime Tue, Wed, Fri @ 1F Laboratory Hallway

5/11 Hanged-Man – Girl at the Shrine
Availability: Daytime Mon, Wed, Sat @ Naganaki Shrine

5/29 Moon – Gourmet King
Availability: Daytime Mon, Tue, Wed, Fri, Sat, Sun @ Paulownia Mall

6/12 Death – Mysterious Boy
Automatic advancement.

6/14 Tower – Unusual Monk
Availability: Evening Thu, Fri, Sat, Sun & Holidays @ Club Escapade (Paulownia Mall)

6/17 Fortune – Art Club
Availability: Daytime Tue, Wed, Thu @ 1F Laboratory Hallway

7/25 Lovers – Yukari Takeba
Availability: Daytime Mon, Wed, Thu, Sat @ Classroom 2-F

8/1 Devil – Businessman
Availability: Evening Tue, Sat @ Paulownia Mall

8/19 Star – Rival Athlete
Availability: Daytime Wed, Fri, Sun @ Iwatodai Station Strip Mall 1F

8/23 Sun – Dying Young Man
Availability: Daytime Sunday @ Naganaki Shrine

9/14 Priestess – Fụuka Yamagishi
Availability: Daytime Mon, Fri, Sat @ 2F Classroom Hallway

11/21 Empress – Mitsuru Kirijo
Availability: Daytime Mon, Tue, Wed, Thu, Fri, Sat @ 1F Faculty Office Hallway

12/31 Judgment – Nyx Annihilation Team
Automatic advancement.

1/8 Aeon – Aigis
Availability: Daytime Mon, Tue, Wed, Thu, Fri, Sat @ Classroom 2-F

These are available during specific times in the story, and are effectively Social Links in all but name (they're even voiced). It's also worth noting that they're not exclusive to members of S.E.E.S. either. Watching them rewards the player with stat boosts and unlocks special persona fusions, so definitely keep an eye out for them and prioritize finishing them to the end.

5/12 - Junpei Link Episode 1
5/29 - Akihiko Link Episode 1
7/24 - Akihiko Link Episode 2
8/9 - Junpei Link Episode 2
8/22 - Koromaru Link Episode 1
9/4 - Shinjiro Link Episode 1
9/8 - Koromaru Link Episode 2
9/8 - Ken Link Episode 1
9/9 - Koromaru Link Episode 3
9/11 - Shinjiro Link Episode 2
9/15 - Koromaru Link Episode 4
9/16 - Ken Link Episode 2
9/21 - Shinjiro Link Episode 3
9/27 - Shinjiro Link Episode 4
10/5 - Shinjiro Link Episode 5
10/9 - Akihiko Link Episode 3
11/7 - Junpei Link Episode 3
11/9 - Ryoji Link Episode 1
11/10 - Ken Link Episode 3
11/12 - Ryoji Link Episode 2
11/18 - Ryoji Link Episode 3
12/1 - Ryoji Link Episode 4
12/12 - Akihiko Link Episode 4
12/19 - Junpei Link Episode 4
12/22 - Ken Link Episode 4
12/31 - Ryoji Link Episode 5
1/5 - Koromaru Link Episode 5
1/8 - Akihiko Link Episode 5
1/15 - Junpei Link Episode 5
1/19 - Ken Link Episode 5

An in-depth look at each Social Link and Link Episode can be found here: https://steamproxy.net/sharedfiles/filedetails/?id=3152126713

You're expected to reach the top floor and complete as much of your Tartarus-related side quests (Elizabeth's Requests & Missing Persons) as possible every time this schedule prompts you to explore Tartarus.

For any non-Tartarus-related requests, stop by the Velvet Room every now and then to complete them in a timely fashion. As a rule of thumb, her requests update after every Full Moon (she reminds you via phone email too).

For a more detailed breakdown of all the side quests in P3R, and where to find the overworld Twinkling Fragments, please see this guide: https://steamproxy.net/sharedfiles/filedetails/?id=3152126686

*self note: I should write down the Sengoku Helm visits next time

*If you don't get a Rank Up, Rewind and use a Dating Site Note from the Suspicious Man
**For killing the Reaper, easy way is to use Armageddon (Helel + Satan) Theurgy
***Messiah is fused via Orpheus + Thanatos, requires Protagonist to be Lv 91

This guide is unlikely to be updated with new details, but if you notice any typos or minor issues, please do point them out for me to address. Likewise, if you have any questions, feel free to ask them here or in the newer version of the guide.

Here's a Persona Fusion Calculator for early game persona fusion to get a matching arcana: https://aqiu384.github.io/megaten-fusion-tool/p3r/personas